CN1452651A - Method and fluid for controlling saturation of formation around well - Google Patents
Method and fluid for controlling saturation of formation around well Download PDFInfo
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- CN1452651A CN1452651A CN01815172.8A CN01815172A CN1452651A CN 1452651 A CN1452651 A CN 1452651A CN 01815172 A CN01815172 A CN 01815172A CN 1452651 A CN1452651 A CN 1452651A
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- C09K8/06—Clay-free compositions
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Abstract
The invention concerns a method and a fluid for drilling or operating in a well passing through a porous and permeable formation, wherein an aqueous well fluid flows into said well. The method consists in adding to the fluid, besides the standard constituents for such a fluid, not more than 3 wt% of a composition obtained from a grease, oil, and an alcohol, the length of the chains of the acid and alcohol parts are selected such that the resulting ester has sufficient dispersion in water, compatibility with said constituents, does not emulsify with the oil of the reservoir and is sufficiently adsorbed on the porous formation.
Description
Invention field
The present invention relates to the drilling well field, more generally relate to the field operation that requires liquid circulation in drilling well, described liquid contacts with the porous permeable rock wall.In these operations, depend on the efficient height of the filtrate-loss control additive that can in liquid, add, circulating liquid passes the thickness of the borehole wall on higher or lower degree.Known " filtrate " (infiltrating the liquid volume of rock) can cause the borehole wall to stop up in varying degrees.If well passes the hydrocarbon output zone, may seriously reduce productivity.The present invention proposes a kind of liquid and a kind of method, is used for drilling well or is used for the initial production of hydrocarbon production rock stratum and promotes these hydrocarbon to flow to well at outlet orifice.
Liquid used when drilling well circulates along the rock stratum at the excessive rolling relevant with underground pressure.This makes that the inflow phenomenon is restricted and the stability of the borehole wall is controlled.Take place to filter phenomenon, cause forming filter cake.Depend on cycling condition (whether mud circulates) in well, during being called " injection " during in form outside and internal cake, perhaps only form internal cake.The filter cake protection rock stratum (particularly oil-saturated reservoir rock) of this very low-permeability is not subjected to the intrusion of drilling mud composition.But, nearest research (A.Audibert, J-F Argillier, H.Ladva, Way P., Hove A. are submitted to SPE Formation Damage's " Role of Polymerson Formation Damage " SPE 54764, The Hague, 1999) show, outside internal cake, form a zone of invading by some mud composition.Particularly under the situation of the oil reservoir that bored with clay-water system, observe intrusion by the oil reservoir of a part of polymkeric substance contained in the mud beyond internal cake.These hydrophilic polymers that do not remain in the filter cake are absorbed in the hole of rock, therefore reduce the oily perviousness of rock.This phenomenon is more remarkable near oil well, and water saturation increases near causing oil well.
The present invention advantageously is applied to crossing over the aqueous slurry prescription that oil reservoir proposes, more generally be called " drilling fluid " (for example at the document " Drill-in FluidsControl Formation Damage " of Halliday W.S., World Oil, Dec.1994,43-47 describes).
Well liquid is complicated liquid, it mainly acts on and particularly clean oil well (well finishing liquid) in drilling process or after drilling well, apply of the security of enough hydraulic pressure with the assurance well, stabilizing borehole, lubricating sleeve tubing string or drill string, or can or realize production process (well finishing liquid) at the bottom building equipment.In order to realize these functions, for example, basic liquid (being water under this situation) contains the oriented specific product that wherein adds to regulate rheological, density, cleansing power and filtrate control.The well solution additive that the saturation ratio of the rock that contacts with liquid is had direct influence is unknown.
Background of invention
Document GB-A-2,283,036 disclose the water-base drilling fluid that contains polyalkylene glycol and ester, and described ester is the part ester of polyvalent alcohol and lipid acid; Its prescription be that these fluids are intended to be used in the rock stratum of clay shale and clay, and they have made up high lubricity and high shale and have suppressed ability.Embodiment discloses with the lower section ester:
-Rylo MG 19;
-TEG monoglyceryl ester; With
-glycerine one ricinoleate.
But embodiment 7 clearlys show that the mixture (2.25 weight % polyalkylene glycols and 0.75 weight % Rylo MG 19) that adds less than 3 weight % can not provide high lubricating property.
Document US-A-5,318,956 (being equivalent to document EP-A-0,398,113) disclose simple function or polyfunctional alcohol and at most the ester of the saturated or unsaturated fatty acids of C36 as the main component of the oil phase of " oil-in-water " O/W emulsion-type drilling fluid.
Document US-A-3,882,029 disclose well finishing liquid and the workover fluid that comprises finely divided solid particulate, and this solid particulate is made up of the homogenous solid solution of following material:
-wax;
The part ester of-glycerine or sorbitan and senior saturated fatty acid (C12-C20), it is oil-soluble and has surfactant properties;
The monoesters of-polyoxyethylene glycol and senior saturated fatty acid (C12-C20) can be dispersed in the water and has surfactant properties;
-ethylene-vinyl acetate copolymer; With
-Fatty Alcohol(C12-C14 and C12-C18).
Document US-A-3,979,304 disclose a kind of infiltrative method that reduces permeable subterranean strata, and it is to add the homogenous solid solution particle that comprises following material in drilling fluid:
-wax;
The part ester of-polyol and higher fatty acid (C12-C20), it is oil-soluble and has surfactant properties;
-water soluble surfactant active, it can be the monoesters of polyoxyethylene glycol and higher fatty acid (C12-C20);
Document WO-A-96/40,835 openly comprise " oil-in-water " O/W type emulsion of salt solution, C7-C23 fatty acid glyceryl ester, alcohol, emulsifying agent and sulfocompound.
Summary of the invention
The purpose of this invention is to provide the drilling well or the method for well fixing that use the water fluid that contains the additive that can reduce or prevent that oil reservoir from damaging.Another purpose provides such method, and wherein, water fluid comprises and can directly enter filtrate and fully be absorbed in additive on the oil-saturated reservoir rock.Another purpose provides described liquid.
Therefore, the present invention relates to a kind of drilling well or method for well fixing, wherein, circulate in the well that a kind of liquid is got out in the hydrocarbon oil-saturated reservoir rock.It also relates to described liquid and use in the methods of the invention thereof.This liquid is water base, gets rid of known liquid in selling with " oil-in-water " O/W type emulsion; In fact, described emulsion has the hole of obstruction and therefore stops additive to pass through the effect of filter cake, and this is opposite with one of purpose of the present invention.Described liquid comprises all additives that drilling well and/or workover fluid function are required and q.s, and maximum 3 weight % preferably are selected from the compound of the part ester of polyvalent alcohol and C6-C22 lipid acid less than one or more of 0.1 weight %.Especially, this part ester preferably adds with the concentrate composition form based on the part ester, and its adding mode makes the concentration of part ester in liquid be about 1g/l.
Unexpectedly, in the well that in the hydrocarbon oil-saturated reservoir rock, gets out, in drilling well and/or workover fluid the use of these additives drilling well and/or well workover stage (until and comprise mining phase, be called initial) can reduce or prevent damage to oil reservoir.Certainly, the character of these additives is according to the special properties decision of water base well liquid, and water base well liquid contains other compatible with it additive of with good grounds additive of the present invention, does not promptly damage the effect of other additive or well liquid composition.
In addition, preferably at least 100 ℃ of flash-points (measuring) according to ASTM D92 standard method, perhaps at least 150 ℃ better.
As for the polyvalent alcohol that forms part ester used among the present invention, they comprise glycol, triol, polyvalent alcohol and blended polyalkoxide and polyol blends.
Can mention following material especially:
-glycerine: HOCH
2-CHOH-CH
2OH;
-two glycerine: HOCH
2-CHOH-CH
2-O-CH
2-CHOH-CH
2OH;
-Polyglycerine: HOCH
2-CHOH-CH
2-(OCH
2-CHOH-CH
2)
n-OCH
2-CHOH-CH
2OH,
Wherein, n is 1-8, is preferably 1-4;
-TriMethylolPropane(TMP): HOCH
2CH
2-CHCH
2OH-CH
2CH
2OH;
-tetramethylolmethane: C (CH
2OH)
4
-ethylene glycol: HOCH
2CH
2OH;
-polyoxyethylene glycol: H (OCH
2CH
2)
nOH,
Wherein, n is 2-30, is preferably 2-12;
-propylene glycol: CH
3-CHOH-CH
2OH;
-polypropylene glycol: H (OCH (CH
3) CH
2)
nOH,
Wherein, n is 2-30, be preferably 2-12 and
-polyethylene glycol-propylene glycol mixture.
The lipid acid that forms part ester used among the present invention has C6-C22, is preferably C6-C12, more preferably the chain length of C8-C10.These chains can be straight chain or branching, saturated or undersaturated, have a natural or synthetic source.The general chain length mixture of the lipid acid in these scopes substantially that uses preferably has natural origin.
Used ester is the part ester among the present invention: they comprise at least one free hydroxyl and at least one is by fatty acid-esterified hydroxyl.The free hydroxyl number with by the mol ratio of fatty acid-esterified hydroxyl value preferably at least 1: 1, preferred ratio is at least 2: 1, preferred ratio is at least 3: 1.
Used part ester can pass through glycerolysis, obtain by direct esterification or by the transesterigfication from fat (or oil) and alcohol among the present invention.All plant and animal fat all is suitable, as long as they have basic chain length in the C6-C12 scope, and preferably between C6-C12, even better chain length between C8-C10.The material that is called fat (or oil) comprises tri-glyceride, lipid acid and methyl ester.The ricin scope that all is equal to is also included within wherein.
Compositions of additives according to the present invention has made up the required various character of its maximum efficiency, particularly about the variation aspect of rock wettability.
In other words, this compositions of additives has the feature of following detailed description:
-good dispersion in the water of well liquid, promptly enough water solubilities, even be not whole dissolvings,
-with the extraordinary consistency of water fluid, the required character of described liquid that provides by other compound or additive promptly is not provided,
-directly enter into the ability of filtrate, promptly be not prevented from or be enclosed in the filter cake that may on the borehole wall, form,
-when in moisture filtrate, existing, do not require the emulsion that forms between described water filtrate and the oil reservoir oil,
-and on rock, fully absorb.
On meaning of the present invention, it is that described part ester must disperse maybe may be dissolved in the character in the water that enough dispersive are understood; Therefore, in described liquid, there be (and under latter event, the part ester in statu quo disperses and is not with the form of mixtures of other compound or additive) in the part ester with solute form or dispersion form.
The applicant observes, and used part ester is not provided by the character of the liquid that is provided by other compound or additive among the present invention.
The applicant also observes, and used part ester has and directly enters in the filtrate and be adsorbed on ability on the oil-saturated reservoir rock among the present invention.Do not wish bound by theory, the applicant thinks that this absorption is to damage the reason that reduces and protect by liquid of the present invention and oil reservoir that use provides in the methods of the invention thereof, as shown in following examples.
In order to keep this ability that directly enters filtrate, water fluid must not be " O/W " emulsion-type liquid that its drop may stop up the filter cake space.
Because identical, when existing in moisture filtrate, the part ester should not require to be formed on the emulsion between described filtrate and the oil reservoir oil.This character is utilized bottle test measurement hereinafter described easily, and bottle test preferably carries out with the typical oil reservoir oil in this zone.
Can use or dilution in solvent oil (above-mentioned plant or animal oil, or mineral oil) with conc forms (as mentioned above, it can add by the concentration of about 1g/l then) according to additive of the present invention.
The accompanying drawing summary
Read description, will know other features and advantages of the present invention by the following non-limiting example of description of drawings:
Fig. 1 is illustrated in the test set on the porous rock sample;
Fig. 2 is the cross section by this device, and it can show sprawling of drop.
Detailed Description Of The Invention
Used Polyglycerine has following composition in following examples:
-glycerine: about 27% (between 24-30%);
-two glycerine: about 31% (between 28-34%);
-triglycerin: about 23% (between 20-26%);
-four glycerine: about 12% (between 9-15%);
-five glycerine: about 7% (between 4-10%);
Be its polymerization degree with 2-3, in fact about 2.4, and average hydroxyl functional number about 4.4.
Press the esterification of moles/mole stoichiometry with C8-C10 lipid acid then, distribute with the majority that reaches single C8-C10 Polyglycerine, hereinafter referred to as PG8/10, free OH/ esterified OH mol ratio is about 3.4: 1." C8-C10 lipid acid " can be understood as the industrial acids of being made up of C8 or C10 acid substantially, but may also contain a small amount of heavier or lighter acid, and it is from natural origin with from manufacturing processed.
Test in the porous medium:
Test in porous medium or experiment purpose are that the simulation filtrate is by oil-saturated reservoir rock and study it to the saturated interaction of original position in rock.Carry out two kinds of experiments:
(i) restore the simulation of filtrate by rock;
The (ii) simulation that all leaches by rock of water-based mud.
In both cases, the residual water saturation of observing rock changes, as observation and in the oily perviousness (adverse current) that leaches on the reverse direction of direction.
The experimental installation graphic table is shown among Fig. 1.
Porous medium 2 is placed in the Hassler unit 1.Apply the confining pressure of 2MPa to medium by squeeze cap 3.Salt solution, oil or simulation filtrate can circulate in this porous medium.Flow by Pharmacia type piston pump 4 solution that control is injected.Differential pressure pickup 5 is placed between the unitary import and export.This device is connected to computer 6, wherein, computer 6 together with other thing together can computing rock to the rate of permeation of injection liquid.
The Clashack sandstone of core sample 2 usefulness experiments (i) or experiment Vosges sandstone are (ii) made.It has following size: 60 millimeters of length, 32.7 millimeters in cross section, volume of voids V
0About 8.5cm
3, porosity about 17%.
Working method is as follows:
(i)
Restore the simulation of filtrate by rock
These stages are necessary:
1) sets up starting condition
Porous medium must with the similar condition of oil reservoir under.So core sample must be used salt solution, use oil saturated then;
(a) use the salt solution saturated rock: saturated in vacuum drier core sample, the confining pressure of passing through 2MPa then, and with 10 the crust pore pressure with 10cm
3/ h is to wherein feeding salt solution (40g/l NaCl, 5g/l KCl) 48 hours.
(b) measure the brinish rate of permeation: with different flows (Q:300,200,100cm
3/ h) make salt solution pass through core sample, and be determined at the pressure difference (Δ P) between the porous medium two ends.The slope of line Q=f (Δ P) makes and can calculate rock to brinish rate of permeation Kw (with millidarcy (milliDarcy) expression).
(c) measure rate of permeation: with 10cm to oil
3/ h injected SOLTROL 130 oil (by the refining oil that Phillips Chemical Co. sells, 80 ℃ of viscosity are 0.7mPas) 24 hours, then gradually from 100cm
3/ h gradually augmented flow to 500cm
3/ h.The volume of collected water makes oil and the water saturation rate (So) and (Sw) can calculated.
Make then oil with different flows (300,200,100cm
3/ h) by core sample, and measure pressure differential deltap P.The slope of line Q=f (Δ P) makes and can calculate the rate of permeation Ko (with millidarcy (milliDarcy) expression) of rock to oil.
2) filtrate is invaded the stage:
The simulation filtrate solution (salt solution or salt solution+additive or salt solution+polymkeric substance or salt solution+polymer+additive) with 10cm
3/ h injects.The volume of collected oil makes can calculate new water and oil saturation.
3) well is produced the dummy run phase:
By with 10cm
3/ h adverse current is injected oil (i.e. the reverse direction that injects with filtrate) simulation and is produced beginning.The volume of collected water makes can calculate new water and oil saturation Sw and So.Make then oil with different flow (300,200,100cm
3/ h) by core sample, and measure pressure differential deltap P.The slope of line Q=f (Δ P) makes can calculate the rate of permeation K of rock to oil
O1(representing) with mD.
(ii)
Water-based mud is by the filtration of rock
1. set up starting condition: as preceding carrying out.
2. dynamic filtration (600s under pressure (3.5MPa) and temperature
-1):
In case saturated under reservoir condition, just core sample is placed in the dynamic filtration unit.Filter water-based mud then, and in filtration procedure, form inside and outside filter cake.This experiment no longer is that the simple analog filtrate is passed through core sample more near physical condition because of actual water-based mud filtrate.
3) oil well production:
Then core sample is transferred in the Hassler unit, injected that oil is measured the saturation ratio of water and oil as previously mentioned and to the recovery rate of permeation of oil by adverse current.
Embodiment 1: saturation ratio changes (salt solution and salt solution+additive)
This experiment is to inject the salt solution that wherein adds or do not add according to additive of the present invention in the presence of the You Heshui under Swi (initial water saturation ratio) condition (type (i) test) in saturated in advance porous medium.
The result provides in following table:
Table 1
Wherein:
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????18.1 | ????775 | Starting condition |
| After filtrate is injected (absorption) | ????55.5 | ||
| After the Soltrol oil adverse current | ????15.8 | ????850 |
-Sw is water saturation (per-cent of contained water in volume of voids)
-Ko (represents that with SI units conversion factor is: 1 darcy=9.87 * 10 with the core sample that millidarcy is represented to the rate of permeation of oil
-13m
2).
Exist in salt solution under the condition of PG8/10 additive of 0.1g/l, the result becomes:
Table 2
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????16 | ????630 | Starting condition |
| After filtrate is injected (absorption) | ????36.7 | ||
| After the Soltrol oil adverse current | ????0 | ????763 |
These leach test and show that the adding of the PG8/10 additive of 0.1g/l can be removed most of residual water.Add additive to the salt solution that injects porous medium and therefore can change saturation ratio, therefore cause higher oily saturation ratio by the displacement residual water.Should be noted that the rate of permeation to oil also increases after adverse current.
Embodiment 2: saturation ratio changes (salt solution that contains polymkeric substance in addition)
Exist 0.5g/l polymkeric substance (polyacrylamide PAM) to carry out identical experiment under with actual composition near the water-based mud filtrate.Under the PAM Individual existence, residual water saturation does not change.But, since polymkeric substance on rock absorption and because the polymer material grain to the obstruction of its hole, makes oily permeability reduction.From following examples, as can be seen, when adding PG8/10, most of residual water have been replaced.Shall also be noted that rock oily rate of permeation reduce than Individual existence PAM the time littler.
Table 3
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????17.5 | ????810 | Starting condition |
| After filtrate is injected (absorption) | ????50.4 | ????+0.5g/l?PAM | |
| After the Soltrol oil adverse current | ????15 | ????693 |
Exist in salt solution under the condition of PG8/10 of 0.1g/l, the result becomes:
Table 4
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????15 | ????738 | Starting condition |
| After filtrate is injected (absorption) | ????40.6 | ????+0.5g/l?PAM | |
| After the Soltrol oil adverse current | ????1 | ????680 |
Can sum up, even in the presence of polymkeric substance, the adding of PG8/10 has been removed most of residual water and has been limited the reduction of oily rate of permeation.
Embodiment 3: saturation ratio changes (prescription fully)
Near physical condition, carry out dynamic filtration for more, simulate rebulid (type is (ii) tested) of oil well production then.The water-based mud prescription is called FLOPRO, and it is sold by MI DrillingFluids Company (USA).
It is composed as follows:
FLOVIS : 6g/l (xanthan gum-tackifier)
FLOTROL : 7g/l (starch-water retaining)
HY-MOD PRIMA : 28.5g/l (filler clay)
NaCl：??????????????20g/l
KCl：???????????????20g/l
IDCARB 75 : 360g/l (carbonate)
pH＝8
The result is as follows:
Table 5
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????36.8 | ????1047 | Starting condition |
| After mud injects (absorption) | ????73 | ????FLOPRO | |
| After the Soltrol oil adverse current | ????53 | ????645 |
Exist in salt solution under the situation of PG8/10 of 0.1g/l, the result becomes:
Table 6
| ????Sw(％) | ????Ko(mD) | ||
| Brine saturation | ????100 | ||
| The injection of oil | ????32.6 | ????1283 | Starting condition |
| After mud injects (absorption) | ????57 | ????FLOPRO | |
| After the Soltrol oil adverse current | ????28.6 | ????845 |
To these experiment confirms of carrying out of prescription fully, about saturation ratio obtained good result (saturation ratio of residual water is 29% after oily adverse current in the presence of the PG8/10 of 1g/l, with do not have additive 53% opposite).
Embodiment 4: the sprawling of drop
Purpose is to show that additive is to effect on rock wettability.For this purpose, observe sprawling on the rock surface (Claschach sandstone) that oil droplet floods in the salt brine solution that contains or do not contain according to additive of the present invention.
Experimental installation (Fig. 2) is to contain the aqueous solution 11 (40g/l NaCl, 5g/l KCl), rock support body 12, petrographic thin section 13 and with the crystallizer 10 of priming can 15 sedimentary oil droplets 14 (Soltrol ).
Working method is as follows: the thin slice of Claschach sandrock-type rock is suspended in contains or do not contain in the salt brine solution of additive.Behind about 40 seconds of dipping, introduce the Soltrol drop of using the Sudan's blue stain at rock surface with pin.In solution, contain then or do not contain according to the formation of observing drop under the additive of the present invention.
In independent salt solution, oil droplet is circular and does not sprawl (Fig. 2).Therefore rock is preferentially by water-wet.Concentration is under the situation of 0.3g/l PG8/10 from salt solution, observe oil droplet and spread on the rock, itself in addition be penetrated in the rock with the active result of 2g/l.These tests are undeclared at this, confirmed that PG8/10 has improved the glossy moist of rock.
Measure surface tension (salt solution/air) and interfacial tension (salt solution/Soltrol) at 25 ℃.Used salt solution contains 40g/l NaCl and 5g/l KC1.During without additive, salt solution/air surface tension force is 72mN/m.During with the 100ppm additive, it is reduced to 25mN/m.When not having additive, salt solution/Soltrol interfacial tension is 38mN/m.During with the 10ppm additive, it is reduced to 19mN/m, reaches 14mN/m during with the 15ppm additive.These results show, PG8/10 has certain interfacial activity, because for the lower concentration less than the CMC (micelle-forming concentration, it is about 100ppm) of PG8/10, it can make the surface tension of water be reduced to 25mN/m, salt solution/Soltrol interfacial tension lowering to 14mN/m.
Embodiment 5: the test on long core sample
Damage simulation test by the oil reservoir that on the long rock sample of 40cm, carries out and show efficient of the present invention.The details of test can be found in following document: " PerformanceEvaluation and Formation Damage Potential of New Water BasedDrilling Formulations ", Argillier J-F, Audibert A., LongeronD.SPE Drilling and Completion, 14, No.4,266-273,1999.Used rock is the Claschach sandstone with following composition: 94.7% quartz, 2.6% potassium felspar sand, 0.5% chlorite and 0.7% illite (comprising mica).The condition that sample stood is called residual water saturation (Swi), its by vacuumize, with the salt water saturation, inject Soltrol130 oil (about 10 volume of voids) then and obtain.The oily rate of permeation of working sample (Ko when Swi) then.Rock sample is contacted with drilling fluid and/or workover fluid along the sample previous cycles under the following conditions: by pressure is raise from 0.35 to 2MPa, be stabilized in 2MPa then, this moment, mud was with 5 liters/minute flow circulation.In filtration procedure, produce oil in the sample end, be equivalent to core sample and invaded by the mud filtrate.Spill promptly when first filtrate come out in the core sample end in filtrate, stop test.
Here used mud is to be contained by the preparation of MI Drilling Fluids (USA) sale and its: 6g/l Flovis (xanthan gum), 7g/l Flotrol (starch), 20g/lNaCl, 20g/l KCl and 360g/l lime carbonate (test 1), and to wherein adding 0.1g/lPG8/10 (test 2).
In the table hereinafter in order to contrast the result that these two tests are provided:
Table 7
| Test 1 | Test 2 | |
| Porosity, φ (%) | ????16.3 | ????16.1 |
| Gas permeability, kg (mD) | ????685 | ????546 |
| The water rate of permeation, Kw (mD) | ????533 | ????416 |
| Oily rate of permeation during Swi, Koi (mD) | ????452 | ????281 |
| Oily rate of permeation after the adverse current, Koi (mD) | ????176 | ????206 |
| The rate of permeation RP that % recovers | ????39 | ????73 |
| Sw (%) after the adverse current | ????27.8 | ????29.5 |
We observe the rate of permeation of recovering (after adverse current) when adding PG8/10 in mud obviously different, particularly in initial several centimetres of core samples.This shows that under the situation of the mud that has additive, in counter-current process, it is easier to be saturated with oil that porous medium becomes again.Therefore, the additive that filtrate is carried secretly preferentially stops up absorption position, limits the absorption/reservation of contained polymkeric substance in the mud thus, and therefore the filtrate that is entered in the porous medium is carried secretly.This has limited obstruction or the contraction of polymkeric substance to hole, has therefore improved oily perviousness.
Embodiment 6: additive passes through filter cake
Owing to add additive in drilling fluid or workover fluid, it must infiltrate permeability rock rock stratum.Under the situation of drilling fluid, it is essential that molecule can enter filtrate by filter cake.So research molecule passing through from filter cake.(70g/l GREEN BOND is by the wilkinite of SBF company sale at GREEN BOND in the test that below provides; 1g/l PAC LV, a kind of anionic low-viscosity cellulose polymkeric substance; 1g/l NaCl) and on the FLOPRO mud (embodiment 3) carry out.
At first, the centrifugal described mud that contains or do not contain PG8/10 is determined the absorption on clay of PG8/10 and polymkeric substance.Also mud filter 23 0 minute under 0.7MPa and room temperature.All solution that obtain are analyzed through TOC, with definite material balance of representing with the ppm of carbon.In order to determine the dependency between the ppm of the ppm of molecule and carbon, obtained the PG8/10 working curve.
For Green Bond mud, the result shows that 35% GP8/10 is adsorbed on the clay, and remaining 65%, 84% passes through filter cake.
For Flopro mud, material balance is more complicated, because exist the contributive polymkeric substance of the carbon value of being surveyed in the filtrate.Nonetheless, when using PG8/10, in filtrate, there is the unexpected increase of carbon, mainly due to there being PG8/10 in the filtrate.
Therefore these test shows, part PG8/10 molecule can be used for improving the saturation ratio at the oil rock layer by filter cake.
Embodiment 7: with the consistency of drilling mud component
Measure the consistency of various components in this product and the mud.For this purpose, studied the character that contains additive mud by rheology with leaching.
For at the Green Bond that contains or do not contain PG8/10 and Flopro mud, this result of study of (P-V) is summarised in the following table after (A-V) and the ageing before ageing:
Table 8
| ?????????A-V | ??????????P-V | ?????????A-V | ?????????P-V | ||||||
| Do not contain PG8/10 | Contain PG8/10 | Do not contain PG8/10 | Contain PG8/10 | Do not contain PG8/10 | Contain PG8/10 | Do not contain PG8/10 | Contain PG8/10 | ||
| GREEN BOND mud | FLOPR) mud | ||||||||
| Viscosity research | AV PV YV Gel 010 | ????36 ????16 ????40 ????2426 | ???38 ???13 ???42 ???2127 | ????33 ????14 ????38 ????2224 | ????34 ????15 ????38 ????2024 | ????9 ????6 ????6 ????510 | ????7 ????66 ????2 ????-- | ????16 ????12 ????8 ????126 | ????15 ????11 ????8 ????5- |
| Filter | 30 minutes filtration volume | ????8ml | ???8ml | ????7ml | ????7ml | ????14ml | ????14ml | ????14ml | ????14ml |
AV: the apparent viscosity of representing with centipoise;
PV: the plastic viscosity of representing with centipoise (1 centipoise=0.001Pas)
YV: yield value 1b/100ft
2Expression.
The adding of 1g/l PG8/10 can obviously not influence leaching or rheological of the mud of testing, and this shows, such additive is defined as the present invention, and is compatible with the traditional components of drilling fluid and/or workover fluid.
Embodiment 8: bottle test
For fear of any extra damage, must estimate the emulsion that between reservoir fluid (salt solution, oil) and mud filtrate, whether produces any original position at the well bore place.
Therefore, one of condition is that the water-based mud filtrate is compatible with reservoir fluid.
In order to make ternary phase diagrams, change the ratio of each phase.Measure the formation and the stability of emulsion by what is called as mentioned below " bottle test ".
The oil bearing reservoir that make salt solution (NaCl 20g/l), organic phase promptly constitute reservoir fluid contact with the mud filtrate that contains additive of the present invention.Described filtrate is made of water, salt and polymkeric substance (xanthan gum 0.5g/l, starch 0.5g/1).Preparation is by the mixture A of 80 milliliters of oil reservoir oil and 20 ml water phase composites and the mixture B of and 40 ml water phase composites oily by 60 milliliters of oil reservoirs.
Water is made up of by following volume ratio 25/75,50/50 and 75/25 salt solution (reservoir fluid) and the mud filtrate that contains 1g/l additive described herein.Stir (stirring at low speed in adition process dropwise for oil reservoir oil with magnetic stirring apparatus, high-speed stirring is 15 minutes then), perhaps stir (stirring at low speed in adition process dropwise stirred 15 minutes with identical speed then) with Hamilton Beach for mould oil.Transfer to emulsion in the flask and observe emulsion and whether destroy.
The result obtains with the following additive of pressing the use of 1g/l concentration.
1. Polyglycerine monooleate (C18)
2. Polyglycerine mono-myristate (C14)
3. Polyglycerine one lauric acid ester (C12)
4. Polyglycerine list C8-C10
5. Polyglycerine one capronate (C6)
Oil reservoir oil is the actual oil reservoir oil with following character:
-density (20 ℃): 850kg/m
3
-viscosity (20 ℃): 8.3cP
-form (SARA method):
-saturated: 56%
-aromatics: 38%
-resin: 6%
-asphaltene: 0.26%
Some tests are carried out with mould oil (Soltrol 130 ), and it does not contain natural surface active agent.
Emulsive danger is illustrated in the following table and (observed after 16 hours unless otherwise indicated).
Table 9
| System | The % of aqueous phase filtrate | Mixture A (80/20) emulsion feature | Mixture B (60/40) emulsion feature |
| Additive-free | ??0 | W/O emulsion (20 volume %) | The big dispersant liquid drop size of W/O emulsion (40 volume %) |
| Additive-free | ??25 | W/O emulsion (20 volume %) | The W/O homogeneous latex emulsion |
| Additive-free | ??50 | Even W/O emulsion | The big dispersant liquid drop size of W/O emulsion (40 volume %) |
| Additive-free | ??75 | Even W/O emulsion | The big dispersant liquid drop size of W/O emulsion (40 volume %) |
| 1 | ??25 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 1 | ??50 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 1 | ??75 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 2 | ??25 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 2 | ??50 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 2 | ??75 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 3 | ??25 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 3 | ??50 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 3 | ??75 | Phase-splitting (17% water) | (13% water after 30 minutes) is separated |
| 4 | ??25 | The big dispersant liquid drop size+water of 6% emulsion | (13% water after 30 minutes) is separated |
| 4 | ??50 | The big dispersant liquid drop size+water of 8% emulsion | (13% water after 30 minutes) is separated |
| 4 | ??75 | The big dispersant liquid drop size+water of 10% emulsion | (13% water after 30 minutes) is separated |
| Table 9 (continuing) | |||
| ??5 | ????25 | The big dispersant liquid drop size+water of 17% emulsion | The big dispersant liquid drop size of emulsion (17 volume % after 1 hour) |
| ??5 | ????50 | The big dispersant liquid drop size+water of 17% emulsion | Phase-splitting (13% water after 1 hour) |
| ??5 | ????75 | The big dispersant liquid drop size+water of 17% emulsion | Phase-splitting (13% water after 1 hour) |
In all cases, in filtrate, exist additive all to bring out breakdown of emulsion (if present).Alkyl chain is long more, and breakdown of emulsion is fast more.
The additional test result who carries out with mould oil SOLTROL 130 is summarised in the following table:
Table 10
| System | The % of the filtrate of aqueous phase | Mixture B (60/40) |
| Additive-free | ????0 | All separate |
| Additive-free | ????50 | All separate: water and organic phase upset |
| 1 | ????50 | All separate: water and organic phase upset |
| 2 | ????50 | All separate: water and organic phase upset |
| 3 | ????50 | All separate: water and organic phase upset |
| 4 | ????50 | All separate: water and organic phase upset |
| 5 | ????50 | All separate: water and organic phase upset |
These results confirm former result: the emulsion that additive does not bring out between oil and water forms.
Also observe, do not having under the condition of stirring, have the sedimentary trend of the pale of formation with the corresponding additive of long sour chain, this expression is near solubility limit.This phenomenon can cause the interaction with other composition of mud.
Claims (13)
1. by drilling well or method for well fixing in the well of porous permeable rock stratum, wherein, water base well liquid circulates in described well, be characterised in that this water base well liquid is not " O/W " emulsion and except the traditional components of described well liquid, one or more that add maximum 3 weight % in described well liquid are selected from the compound of the part ester of polyvalent alcohol and C6-C22 lipid acid, select the chain length of acid and alcohol moiety make the ester that is obtained in water, have enough dispersivenesses, with the consistency of described component, with oil reservoir oily formation emulsion and fully be adsorbed on the porous layer.
2. the process of claim 1 wherein that the chain length scope of lipid acid is C6-C12, is preferably C8-C10.
3. claim 1 or 2 each method, wherein, in the part ester, the free hydroxyl number be at least 1: 1 preferably at least 2: 1, more preferably at least 3: 1 by the mol ratio of fatty acid-esterified hydroxyl value.
4. the method for each of aforementioned claim, wherein, described composition is C8-C10 lipid acid and polyglycerol ester.
5. the method for claim 4, wherein, described Polyglycerine has the glycerine of following composition: 24-30%, is preferably 27%; Two glycerine of 28-34% are preferably 31%; The triglycerin of 20-26% is preferably 23%; Four glycerine of 9-15% are preferably 12%; 4-10% five glycerine are preferably 7%.
6. the method for each of aforementioned claim, wherein, described well liquid contains the described composition of maximum 1g/l.
7. water base well liquid, it comprises traditional components such as water retaining, tackifier, weighting material, be characterised in that this water base well liquid be not " O/W " emulsion and its contain maximum 3 weight % in addition one or more be selected from the compound of the part ester of polyvalent alcohol and C6-C22 lipid acid, select the chain length of acid and alcohol moiety make the ester that is obtained in water, have enough dispersivenesses, with the consistency of described component, with oil reservoir oil formation emulsion and fully be adsorbed on the porous layer.
8. the well liquid of claim 7, wherein, the chain length scope of lipid acid is C6-C12, is preferably C8-C10.
9. claim 7 or 8 each well liquid, wherein, in the part ester, the free hydroxyl number be at least 1: 1 preferably at least 2: 1, more preferably at least 3: 1 by the mol ratio of fatty acid-esterified hydroxyl value.
10. the well liquid of each of aforementioned claim, wherein, described composition is C8-C10 lipid acid and polyglycerol ester.
11. the well liquid of claim 10, wherein, described Polyglycerine has the glycerine of following composition: 24-30%, is preferably 27%; Two glycerine of 28-34% are preferably 31%; The triglycerin of 20-26% is preferably 23%; Four glycerine of 9-15% are preferably 12%; 4-10% five glycerine are preferably 7%.
12. the well liquid of each of aforementioned claim, wherein, described well liquid contains the described composition of maximum 1g/l.
13. the water base well liquid in each of claim 7-12 is used for drilling well or well workover to reduce or to prevent the purposes that oil reservoir damages in the well by the porous permeable rock stratum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0008707A FR2811326B1 (en) | 2000-07-05 | 2000-07-05 | METHOD AND FLUID FOR CONTROLLING THE SATURATION OF A FORMATION ABOUT A WELL |
| FR00/08707 | 2000-07-05 |
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| Publication Number | Publication Date |
|---|---|
| CN1452651A true CN1452651A (en) | 2003-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01815172.8A Pending CN1452651A (en) | 2000-07-05 | 2001-06-25 | Method and fluid for controlling saturation of formation around well |
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|---|---|
| US (1) | US6740625B1 (en) |
| EP (1) | EP1412448B1 (en) |
| JP (1) | JP5235258B2 (en) |
| CN (1) | CN1452651A (en) |
| AT (1) | ATE410494T1 (en) |
| AU (2) | AU7066101A (en) |
| BR (1) | BR0112233A (en) |
| DE (1) | DE60136106D1 (en) |
| DK (1) | DK1412448T3 (en) |
| ES (1) | ES2315290T3 (en) |
| FR (1) | FR2811326B1 (en) |
| MX (1) | MXPA03000158A (en) |
| MY (1) | MY141021A (en) |
| NO (1) | NO331531B1 (en) |
| NZ (1) | NZ523996A (en) |
| RU (1) | RU2277114C2 (en) |
| WO (1) | WO2002002713A1 (en) |
| ZA (1) | ZA200300123B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106543993A (en) * | 2016-11-07 | 2017-03-29 | 天津博科瑞精细化学有限公司 | Drilling fluid environment-friendly type low Poison sealing agent and preparation method thereof |
| CN109083630A (en) * | 2018-08-30 | 2018-12-25 | 陕西延长石油(集团)有限责任公司研究院 | A method of for appraisal drilling liquid sealing characteristics |
| CN110715887A (en) * | 2018-07-12 | 2020-01-21 | 中国石油化工股份有限公司 | Bituminous sand porosity determination device and method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7238647B2 (en) * | 2000-07-05 | 2007-07-03 | Institut Francais Du Petrole | Method and fluid for controlling the saturation of a formation around a well |
| US9200996B2 (en) * | 2012-04-13 | 2015-12-01 | Saudi Arabian Oil Company | Method for dispersion and adsorption coefficient estimation using an analysis of pressure transition during a viscosity-switch |
| CN103939091A (en) * | 2013-01-23 | 2014-07-23 | 刘怀珠 | Radial flow displacement physical model system |
| CN103643943B (en) * | 2013-11-20 | 2016-05-18 | 中国石油大学(北京) | Determine analogue experiment installation and the method for continuous and compact sandstone gas Tibetan distribution |
| CN107476788A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | Crude oil injection method |
| CN113445975B (en) * | 2020-03-26 | 2023-07-25 | 中国石油天然气股份有限公司 | Device and application, and underground coal gasification test system and method |
| RU2757767C2 (en) * | 2020-03-27 | 2021-10-21 | Ооо "Нбс" | Emulsion drilling mud |
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|---|---|---|---|---|
| US2271696A (en) * | 1936-01-20 | 1942-02-03 | Union Oil Co | Conditioned well drilling fluid |
| US3047493A (en) * | 1958-05-26 | 1962-07-31 | Gulf Research Development Co | Drilling process and water base drilling muds |
| US3379708A (en) * | 1964-11-23 | 1968-04-23 | Phillips Petroleum Co | Esters of tall oil pitch and polyoxyethylene compounds and their use as drilling fluid additives |
| US3979304A (en) * | 1972-09-29 | 1976-09-07 | Union Oil Company Of California | Method for drilling and treating subterranean formations using a low fluid loss agent |
| US3882029A (en) * | 1972-09-29 | 1975-05-06 | Union Oil Co | Well completion and workover fluid |
| US4409108A (en) * | 1980-06-02 | 1983-10-11 | Halliburton Company | Lubricating composition for well fluids |
| DE3622826A1 (en) * | 1986-07-08 | 1988-01-21 | Henkel Kgaa | POWDERED LUBRICANT ADDITIVES FOR WATER-BASED DRILL RINSING |
| DE3915876A1 (en) * | 1989-05-16 | 1990-11-22 | Henkel Kgaa | USE OF SELECTED ESTEROILS IN WATER-BASED DRILLING RINSES OF THE O / W EMULSION TYPE AND CORRESPONDING DRILLING LIQUIDS WITH IMPROVED ECOLOGICAL TOLERABILITY |
| DE4019266A1 (en) * | 1990-06-16 | 1992-01-23 | Henkel Kgaa | FLOW -ABLE BOHRLOCHANGE AGENTS BASED ON POLYCARBONIC ACID ESTERS |
| DE4102908A1 (en) * | 1991-01-31 | 1992-08-06 | Henkel Kgaa | USE OF SURFACTANT CARBONIC ACID COMPLEXESTERS AS EMULSIFICATORS IN OIL-BASED DRILLING RINSES AND OTHER DRILLING TREATMENTS |
| GB9321856D0 (en) * | 1993-10-22 | 1993-12-15 | Bp Chem Int Ltd | Drilling fluid |
| US5707940A (en) * | 1995-06-07 | 1998-01-13 | The Lubrizol Corporation | Environmentally friendly water based drilling fluids |
| DE19546911A1 (en) * | 1995-12-15 | 1997-06-19 | Henkel Kgaa | New aqueous-swellable preparations of guar and guar derivatives in oleophilic liquids and their use |
| US5807811A (en) * | 1996-08-23 | 1998-09-15 | The Lubrizol Corporation | Water-based drilling fluids containing phosphites as lubricating aids |
| US6407302B1 (en) * | 1999-11-04 | 2002-06-18 | Bp Corporation North America Inc. | Isomerization process of a mixture containing vinyl and vinylidene olefins |
-
2000
- 2000-07-05 FR FR0008707A patent/FR2811326B1/en not_active Expired - Lifetime
- 2000-07-28 US US09/628,423 patent/US6740625B1/en not_active Expired - Lifetime
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- 2001-06-25 WO PCT/FR2001/002012 patent/WO2002002713A1/en active IP Right Grant
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- 2001-06-25 EP EP01949524A patent/EP1412448B1/en not_active Expired - Lifetime
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106543993A (en) * | 2016-11-07 | 2017-03-29 | 天津博科瑞精细化学有限公司 | Drilling fluid environment-friendly type low Poison sealing agent and preparation method thereof |
| CN106543993B (en) * | 2016-11-07 | 2020-01-14 | 天津天诚拓源科技发展有限公司 | Environment-friendly low-fluorescence plugging agent for drilling fluid and preparation method thereof |
| CN110715887A (en) * | 2018-07-12 | 2020-01-21 | 中国石油化工股份有限公司 | Bituminous sand porosity determination device and method |
| CN109083630A (en) * | 2018-08-30 | 2018-12-25 | 陕西延长石油(集团)有限责任公司研究院 | A method of for appraisal drilling liquid sealing characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1412448A1 (en) | 2004-04-28 |
| EP1412448B1 (en) | 2008-10-08 |
| ES2315290T3 (en) | 2009-04-01 |
| AU7066101A (en) | 2002-01-14 |
| NZ523996A (en) | 2004-12-24 |
| DE60136106D1 (en) | 2008-11-20 |
| AU2001270661B2 (en) | 2005-05-12 |
| JP5235258B2 (en) | 2013-07-10 |
| ATE410494T1 (en) | 2008-10-15 |
| DK1412448T3 (en) | 2009-02-16 |
| NO20030031D0 (en) | 2003-01-03 |
| WO2002002713A1 (en) | 2002-01-10 |
| JP2004519526A (en) | 2004-07-02 |
| BR0112233A (en) | 2003-05-06 |
| ZA200300123B (en) | 2004-04-01 |
| US6740625B1 (en) | 2004-05-25 |
| RU2277114C2 (en) | 2006-05-27 |
| NO331531B1 (en) | 2012-01-23 |
| FR2811326A1 (en) | 2002-01-11 |
| NO20030031L (en) | 2003-03-04 |
| MY141021A (en) | 2010-02-25 |
| FR2811326B1 (en) | 2003-09-05 |
| MXPA03000158A (en) | 2004-09-13 |
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